saving colormap

Question

Namrata 2011-3-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/4230-saving-colormap

below are the commands I am using:

cmap = contrast(Grayscale_Image,100);

colormap(cmap);

The resulting colormap is needed to be saved as an image for further processing on it.Is there any way to do so?

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Answer 1

Walter Roberson 2011-3-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/4230-saving-colormap#answer_5975

在 MATLAB Online 中打开

ImageWidth = 20;
cmapimg = repmat(reshape(cmap,size(cmap,1),1,3), 1, ImageWidth, 1);

Now use your favorite image writing routine on cmapimg. The result will be a vertical stripe of colors ImageWidth pixels wide with the rows all the same color. (That is, to store it as an image, you really only need a single pixel of each color, but that is hard for humans to see, so this code broadens it out to ImageWidth identical pixels.)